1 /* 2 * linux/drivers/mmc/core/bus.c 3 * 4 * Copyright (C) 2003 Russell King, All Rights Reserved. 5 * Copyright (C) 2007 Pierre Ossman 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * MMC card bus driver model 12 */ 13 14 #include <linux/export.h> 15 #include <linux/device.h> 16 #include <linux/err.h> 17 #include <linux/slab.h> 18 #include <linux/stat.h> 19 #include <linux/pm_runtime.h> 20 21 #include <linux/mmc/card.h> 22 #include <linux/mmc/host.h> 23 24 #include "core.h" 25 #include "sdio_cis.h" 26 #include "bus.h" 27 28 #define to_mmc_driver(d) container_of(d, struct mmc_driver, drv) 29 30 static ssize_t mmc_type_show(struct device *dev, 31 struct device_attribute *attr, char *buf) 32 { 33 struct mmc_card *card = mmc_dev_to_card(dev); 34 35 switch (card->type) { 36 case MMC_TYPE_MMC: 37 return sprintf(buf, "MMC\n"); 38 case MMC_TYPE_SD: 39 return sprintf(buf, "SD\n"); 40 case MMC_TYPE_SDIO: 41 return sprintf(buf, "SDIO\n"); 42 case MMC_TYPE_SD_COMBO: 43 return sprintf(buf, "SDcombo\n"); 44 default: 45 return -EFAULT; 46 } 47 } 48 49 static struct device_attribute mmc_dev_attrs[] = { 50 __ATTR(type, S_IRUGO, mmc_type_show, NULL), 51 __ATTR_NULL, 52 }; 53 54 /* 55 * This currently matches any MMC driver to any MMC card - drivers 56 * themselves make the decision whether to drive this card in their 57 * probe method. 58 */ 59 static int mmc_bus_match(struct device *dev, struct device_driver *drv) 60 { 61 return 1; 62 } 63 64 static int 65 mmc_bus_uevent(struct device *dev, struct kobj_uevent_env *env) 66 { 67 struct mmc_card *card = mmc_dev_to_card(dev); 68 const char *type; 69 int retval = 0; 70 71 switch (card->type) { 72 case MMC_TYPE_MMC: 73 type = "MMC"; 74 break; 75 case MMC_TYPE_SD: 76 type = "SD"; 77 break; 78 case MMC_TYPE_SDIO: 79 type = "SDIO"; 80 break; 81 case MMC_TYPE_SD_COMBO: 82 type = "SDcombo"; 83 break; 84 default: 85 type = NULL; 86 } 87 88 if (type) { 89 retval = add_uevent_var(env, "MMC_TYPE=%s", type); 90 if (retval) 91 return retval; 92 } 93 94 retval = add_uevent_var(env, "MMC_NAME=%s", mmc_card_name(card)); 95 if (retval) 96 return retval; 97 98 /* 99 * Request the mmc_block device. Note: that this is a direct request 100 * for the module it carries no information as to what is inserted. 101 */ 102 retval = add_uevent_var(env, "MODALIAS=mmc:block"); 103 104 return retval; 105 } 106 107 static int mmc_bus_probe(struct device *dev) 108 { 109 struct mmc_driver *drv = to_mmc_driver(dev->driver); 110 struct mmc_card *card = mmc_dev_to_card(dev); 111 112 return drv->probe(card); 113 } 114 115 static int mmc_bus_remove(struct device *dev) 116 { 117 struct mmc_driver *drv = to_mmc_driver(dev->driver); 118 struct mmc_card *card = mmc_dev_to_card(dev); 119 120 drv->remove(card); 121 122 return 0; 123 } 124 125 static int mmc_bus_suspend(struct device *dev) 126 { 127 struct mmc_driver *drv = to_mmc_driver(dev->driver); 128 struct mmc_card *card = mmc_dev_to_card(dev); 129 int ret = 0; 130 131 if (dev->driver && drv->suspend) 132 ret = drv->suspend(card); 133 return ret; 134 } 135 136 static int mmc_bus_resume(struct device *dev) 137 { 138 struct mmc_driver *drv = to_mmc_driver(dev->driver); 139 struct mmc_card *card = mmc_dev_to_card(dev); 140 int ret = 0; 141 142 if (dev->driver && drv->resume) 143 ret = drv->resume(card); 144 return ret; 145 } 146 147 #ifdef CONFIG_PM_RUNTIME 148 149 static int mmc_runtime_suspend(struct device *dev) 150 { 151 struct mmc_card *card = mmc_dev_to_card(dev); 152 153 return mmc_power_save_host(card->host); 154 } 155 156 static int mmc_runtime_resume(struct device *dev) 157 { 158 struct mmc_card *card = mmc_dev_to_card(dev); 159 160 return mmc_power_restore_host(card->host); 161 } 162 163 static int mmc_runtime_idle(struct device *dev) 164 { 165 return pm_runtime_suspend(dev); 166 } 167 168 #endif /* !CONFIG_PM_RUNTIME */ 169 170 static const struct dev_pm_ops mmc_bus_pm_ops = { 171 SET_RUNTIME_PM_OPS(mmc_runtime_suspend, mmc_runtime_resume, 172 mmc_runtime_idle) 173 SET_SYSTEM_SLEEP_PM_OPS(mmc_bus_suspend, mmc_bus_resume) 174 }; 175 176 static struct bus_type mmc_bus_type = { 177 .name = "mmc", 178 .dev_attrs = mmc_dev_attrs, 179 .match = mmc_bus_match, 180 .uevent = mmc_bus_uevent, 181 .probe = mmc_bus_probe, 182 .remove = mmc_bus_remove, 183 .pm = &mmc_bus_pm_ops, 184 }; 185 186 int mmc_register_bus(void) 187 { 188 return bus_register(&mmc_bus_type); 189 } 190 191 void mmc_unregister_bus(void) 192 { 193 bus_unregister(&mmc_bus_type); 194 } 195 196 /** 197 * mmc_register_driver - register a media driver 198 * @drv: MMC media driver 199 */ 200 int mmc_register_driver(struct mmc_driver *drv) 201 { 202 drv->drv.bus = &mmc_bus_type; 203 return driver_register(&drv->drv); 204 } 205 206 EXPORT_SYMBOL(mmc_register_driver); 207 208 /** 209 * mmc_unregister_driver - unregister a media driver 210 * @drv: MMC media driver 211 */ 212 void mmc_unregister_driver(struct mmc_driver *drv) 213 { 214 drv->drv.bus = &mmc_bus_type; 215 driver_unregister(&drv->drv); 216 } 217 218 EXPORT_SYMBOL(mmc_unregister_driver); 219 220 static void mmc_release_card(struct device *dev) 221 { 222 struct mmc_card *card = mmc_dev_to_card(dev); 223 224 sdio_free_common_cis(card); 225 226 if (card->info) 227 kfree(card->info); 228 229 kfree(card); 230 } 231 232 /* 233 * Allocate and initialise a new MMC card structure. 234 */ 235 struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type) 236 { 237 struct mmc_card *card; 238 239 card = kzalloc(sizeof(struct mmc_card), GFP_KERNEL); 240 if (!card) 241 return ERR_PTR(-ENOMEM); 242 243 card->host = host; 244 245 device_initialize(&card->dev); 246 247 card->dev.parent = mmc_classdev(host); 248 card->dev.bus = &mmc_bus_type; 249 card->dev.release = mmc_release_card; 250 card->dev.type = type; 251 252 return card; 253 } 254 255 /* 256 * Register a new MMC card with the driver model. 257 */ 258 int mmc_add_card(struct mmc_card *card) 259 { 260 int ret; 261 const char *type; 262 const char *uhs_bus_speed_mode = ""; 263 static const char *const uhs_speeds[] = { 264 [UHS_SDR12_BUS_SPEED] = "SDR12 ", 265 [UHS_SDR25_BUS_SPEED] = "SDR25 ", 266 [UHS_SDR50_BUS_SPEED] = "SDR50 ", 267 [UHS_SDR104_BUS_SPEED] = "SDR104 ", 268 [UHS_DDR50_BUS_SPEED] = "DDR50 ", 269 }; 270 271 272 dev_set_name(&card->dev, "%s:%04x", mmc_hostname(card->host), card->rca); 273 274 switch (card->type) { 275 case MMC_TYPE_MMC: 276 type = "MMC"; 277 break; 278 case MMC_TYPE_SD: 279 type = "SD"; 280 if (mmc_card_blockaddr(card)) { 281 if (mmc_card_ext_capacity(card)) 282 type = "SDXC"; 283 else 284 type = "SDHC"; 285 } 286 break; 287 case MMC_TYPE_SDIO: 288 type = "SDIO"; 289 break; 290 case MMC_TYPE_SD_COMBO: 291 type = "SD-combo"; 292 if (mmc_card_blockaddr(card)) 293 type = "SDHC-combo"; 294 break; 295 default: 296 type = "?"; 297 break; 298 } 299 300 if (mmc_sd_card_uhs(card) && 301 (card->sd_bus_speed < ARRAY_SIZE(uhs_speeds))) 302 uhs_bus_speed_mode = uhs_speeds[card->sd_bus_speed]; 303 304 if (mmc_host_is_spi(card->host)) { 305 pr_info("%s: new %s%s%s card on SPI\n", 306 mmc_hostname(card->host), 307 mmc_card_highspeed(card) ? "high speed " : "", 308 mmc_card_ddr_mode(card) ? "DDR " : "", 309 type); 310 } else { 311 pr_info("%s: new %s%s%s%s%s card at address %04x\n", 312 mmc_hostname(card->host), 313 mmc_card_uhs(card) ? "ultra high speed " : 314 (mmc_card_highspeed(card) ? "high speed " : ""), 315 (mmc_card_hs200(card) ? "HS200 " : ""), 316 mmc_card_ddr_mode(card) ? "DDR " : "", 317 uhs_bus_speed_mode, type, card->rca); 318 } 319 320 #ifdef CONFIG_DEBUG_FS 321 mmc_add_card_debugfs(card); 322 #endif 323 324 ret = device_add(&card->dev); 325 if (ret) 326 return ret; 327 328 mmc_card_set_present(card); 329 330 return 0; 331 } 332 333 /* 334 * Unregister a new MMC card with the driver model, and 335 * (eventually) free it. 336 */ 337 void mmc_remove_card(struct mmc_card *card) 338 { 339 #ifdef CONFIG_DEBUG_FS 340 mmc_remove_card_debugfs(card); 341 #endif 342 343 if (mmc_card_present(card)) { 344 if (mmc_host_is_spi(card->host)) { 345 pr_info("%s: SPI card removed\n", 346 mmc_hostname(card->host)); 347 } else { 348 pr_info("%s: card %04x removed\n", 349 mmc_hostname(card->host), card->rca); 350 } 351 device_del(&card->dev); 352 } 353 354 put_device(&card->dev); 355 } 356 357